With smaller sample sizes contributing to means in the distribution of sample means, a) we can expect narrower distributions of sample means, as the math of the standard error suggests. Ob) we can expect narrower distributions of sample means, but the math of the standard error does not necessarily reveal that. Oc) we can expect broader distributions of sample means, but the math of the standard error does not necessarily reveal that. "d) we can expect broader distributions of sample means, as the math of the standard error suggests